Estimating the Baseline Error of Wide-Swath Altimeters Using Nadir Altimeters via Numerical Simulation

Miao, Xiangying; Jia, Yongjun; Lin, Mingsen; Miao, Hongli

doi:10.1007/s11802-022-4434-3

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The baseline parameters need to be extremely accurate to ensure SSH accuracy within the entire swath. Taking SWOT parameters as an example, a roll error of 1 arcsec and a baseline length error of 1 mm would cause approximately 30 cm and 40 cm of SSH error, respectively, at the far edge of swath [26]. Spaceborne wide-swath altimeters usually need to be equipped with high-precision gyroscopes and other auxiliary instruments to measure the satellite's flight attitude in real time.…”

Section: Introductionmentioning

confidence: 99%

“…Miao et al conducted a simulation study to estimate and correct the baseline error using the cross-matching method of different numbers of nadir altimeter constellations and wide-swath altimeters. The results showed that the correction ability using a single nadir altimeter as reference data is limited, but using a constellation consisting of 3~5 nadir altimeters can provide an ideal estimation of wide-swath altimeter baseline error [26]. Miao et al investigated the baseline error correction method by constructing reference topography data (RTD) using mean sea surface products and daily SSH anomaly products.…”

Section: Introductionmentioning

confidence: 99%

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Timeliness of Correcting Baseline Error in Wide-Swath Altimeter Based on Reference Topography Data

et al. 2023

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The baseline error is a primary error source of the wide-swath altimeter, directly related to the cross-track distance, and can lead to serious height errors at the swath’s outer edge. Cross-calibration using discrepancies with reference data can effectively estimate and correct the baseline error. However, building a reference surface that accurately describes the sea surface at the observation time is necessary to use this cross-correction method. The dynamic ocean environments where the sea surface structure changes over time are challenging. This paper proposes a method for constructing reference topography data (RTD) based on multi-source data products to correct the baseline error of the wide-swath altimeter. The effectiveness of the proposed method is evaluated using HYCOM ocean model data to assess the timeliness of the baseline error correction. The results demonstrate that using RTD at the observation time of the wide-swath altimeter can significantly correct the baseline error. The RMSE of the corrected sea surface height (SSH) in different regions is typically between 1~2 cm, except in some regions with strong currents where the RMSE is approximately 3~4 cm. However, the time interval between the RTD and the observation time of the wide-swath altimeter can affect the accuracy of the baseline error correction. The timeliness of this correction is influenced by the variability of SSH in different regions. In regions with relatively slow SSH changes near the equator, the effective time based on HYRTD and MORTD can basically reach more than 7 days. In regions where the SSH changes more rapidly, the correction result may no longer be reliable in only 1~3 days.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%